In Photography version 4.3 or later. We added gallery & portfolio items hover effect options. So when you move mouse over it. It will play various of effect options.

Customise Gallery item hover effect

Navigate to Appearance > Customize > Gallery > General > Gallery Thumbnails Hover Effect and select you want to use there.

Customise Portfolio item hover effect

Navigate to Appearance > Customize > Portfolio > General > Portfolio Thumbnails Hover Effect and select you want to use there.